NZ227485A

NZ227485A - Hydroxycycloalkyl (or cycloalkenyl) n-substituted adenosine derivatives; processes for preparation and pharmaceutical compositions

Info

Publication number: NZ227485A
Application number: NZ227485A
Authority: NZ
Inventors: Brian Evans
Original assignee: Glaxo Group Ltd
Priority date: 1987-12-23
Filing date: 1988-12-22
Publication date: 1991-06-25
Also published as: HU203364B; AU2740188A; HUT48903A; IL88765A; CN1035295A; GR1000307B; KR890009967A; IE883845L; HK1009650A1; EP0322242A3; CZ403991A3; EP0322242B1; DE3856154D1; IT1224840B; RU2060996C1; GB8829983D0; GB8729994D0; DK170894B1; AU612747B2; ATA315488A

Description

<div class="application article clearfix" id="description"> New Zealand Paient Spedficaiion for Paient Number £27485 22 7 4 NO DRAWINGS Priority Date(s); .. .r& .} 2-...*£7; Complete Specification filed: I a*A** Publication Date: ..2,5, JUNtSBI P.O. Journal. No: .... .)j3 <l-S • Patents Form No. 5 NEW ZEALAND PATENTS ACT 1953 ^ COMPLETE SPECIFICATION ,^V o\ i^oSC/9 1; ADENOSINE DERIVATIVES 'tyy *Uy-JSy </We, GLAXO GROUP LIMITED, a British company of Clarges House, 6-12 Clarges Street, London W1Y 8DH, England hereby declare the invention, for which j£/we pray that a patent may be granted to nvja/us, and the method by which it is to be performed, to be particularly described in and by the following statement: - 1 - (followed by Page la) LT° 227405 - la -ADENOSINE DERIVATIVES This invention relates to novel adenosine derivatives, to processes for their preparation, to pharmaceutical compositions containing them and to their use in medicine* In particular, the invention rel^tgs to compounds which act as inhibitors of lipolysis. 5 GO A iMffiSO discloses compounds of formula R A-X-B \ / N I /A N • N 10 III • • • / \\ / \ / Y N N hoh>c\ a! 15 OH OH wherein Y is a halogen atom or a hydroxyl group, R is a hydrogen atom 20 or an alkyl group, A is a saturated or unsaturated straight- or branched-chain or cyclic aliphatic hydrocarbon group which may be substituted by one or more hydroxyl and/or acyloxy groups, X is a valency bond or an oxygen or sulphur atom or an optionally alkylated or acylated imino group and B is a hydrogen atom or an optionally 25 substituted phenyl or naphthyl group. These compounds are said to exhibit cardiac and circulatory actions. No compound is exemplified in which -A-X-B represents a cycloalkyl or cycloalkenyl^imLsu^stituted by a hydroxy group and 30 there is no suggestion in GO-A JLJ.<t3JL50 that any of the compounds disclosed possess anti-lipolytic activity. We have now found a novel group of N(6)-monosubstituted adenosine derivative^pRUich-'-diffeE--structurally from those previously described, and which act aj inhibitors of lipolysis. Thus the invention provides compounds of formula (1)^ 2^APRJ99)£ji ; V * ^ '7 1 - 2 - 22 7 4 RljlH i I I A A/" (i) 5 X N N hAa! i I • • OH OH 10 wherein X represents a hydrogen or chlorine atom, or a methyl group; end R represents a cycloalkyl or cycloalkenyl ring containing 5 to 8 carbon atoms, which ring is substituted by a hydroxy group, and is optionally substituted by a C1_6alkyl group; and salts and solvates thereof, in particular physiologically acceptable salts and solvates thereof. It will be appreciated that when the group R contains one or more asymmetric carbon atoms, then the invention includes all resulting diastereoisomers and mixtures thereof. As used herein, the term cycloalkenyl refers to a 5 to 8 membered 20 ring containing a single double bond. Particular examples of the group R include: 25 - 3 - 227405 HO \ ! I • • / \ / 3 / ► \ \_DH * / ' HO HO Me \ \ / • « • « 11,11 • • J • 4 / \ // / \ / ) 1 ! > / v !sh • # • • • • / \ / \ / \ > —* and —• \ / ' \ / \ / \ / / \ OH HO HO Me Suitable physiologically acceptable salts of the compounds of general formula (I) include acid addition salts derived from inorganic or organic acids, such as sulphates, phosphates, benzoates, camphorsulphonates, £-toluenesulphonates, methanesulphonates, sulphemates, ascorbates, tartrates, citrates, maleates, salicylates, fumarates, succinates, lactates, glutarates, glutaconates, acetates or tricarballylates. The solvates may be, for example, hydrates. A preferred class of compounds of formula (I) is that in which X represents a hydrogen atom or a methyl group, more preferably a hydrogen atom. A further preferred class of compounds of formula (I) is that in which the group R represents a cycloalkyl or cycloalkenyl ring containing 5 or 6 carbon atoms, substituted by a hydroxy group at any available position. The ring may be optionally substituted by a Cx_aalkyl (e.g. methyl or ethyl) group. More preferably, R represents a cycloalkyl ring containing 5 or 6 carbon atoms substituted by a hydroxy group at any available position, and optionally substituted by a C1_aalkyl (e.g.methyl) group on the same carbon atom as the hydroxy group. A particularly preferred class of compounds of formula (I) is that in which R represents a 2-hydroxycyclopentyl, 4-hydroxy- CyCloheXyl, 3-hydrOXyCydoheXyl Or 7-hyrlrnvy-9-mpf-hy 1 n^onf y i group. Preferred compounds according to the invention are: N-[(IS, trans)-2-hydroxycyclopentyl]adenosine; 4j 2 2 7 4 f<-[(1R, trans)-2-hydroxycyclopenty1jadenosine; and mixtures thereof; N-(tran8-4-hydroxycyclohexyl)-2-methyladenosine; N-(cis-4-hydroxycyclohexyl)adeno8ine; N-(ci8-2-hydroxycyclopentyl)adenoaine; N-(trans-3-hydroxycyclohexyl)adeno8ine; f>l-(2p-hydroxy-2-methylcyclopentyl)adeno8ine; N-(cis-2-hydroxycyclohexyl)adenosine; and physiologically acceptable salts and solvates thereof. Particularly preferred compounds according to the invention are: IN-[(1S, trana)-2-hydroxycyclopent-yl]adenosine and N-[(1R, trans)-2-hydroxycyclopentyl]adeno8ine and mixtures thereof, more especially N-[IS,trans)-2-hydroxycyclopenty1]adenosine and physiologically acceptable salts and solvates thereof. Tests in animals have shown that the compounds according to the invention are inhibitors of lipolysis i.e. they decrease plasma free fatty acid concentrations. The compounds may thus be used in the treatment of hyperlipidaemias. Furthermore, as a consequence of their anti-lipolytic activity, the compounds have the ability to lower elevated blood glucose and ketone body levels and therefore may be of value in the therapy of diabetes. Since anti-lipolytic agents have hypolipidaemic and hypofibrinogenaemic activity, the compounds may also show anti-athero8clerotic activity. The anti-lipolytic activity of compounds according to the invention has been demonstrated by their ability to lower the concentration of non-esterified fatty acids (NEFA) in starved rats dosed orally. An especially important group of compounds on account of their marked anti-lipolytic effect,is that group of compounds of formula (I) in which X represents a hydrogen atom, and R represents a cyclopentyl ring substituted by a hydroxy group and optionally also substituted by a Cx_6alkyl (e.g.methyl) group. In addition to their anti-lipolytic effect, the compounds of the invention may independently affect cardiac function by reducing heart rate and conduction. The compounds may thus be used in the therapy of a number of cardiovascular disorders, for example cardiac arrythmias, <'36 k f* \ ' * ._ |„ ,,,iMi(WW>nMi>»^iin—ni mnwM'iMiHiiiimiirmil 'ii.irui'jitiii r. ? 2 7 4 £ 5 - 5 - particularly following myocardial infarction, and angina. The compounds may also inhibit renin release and thus be of use in the therapy of hypertension and heart failure. The compounds may also be useful as CNS agents (e.g. as hypnotics, sedatives, analgetics and/or 5 anti-convulsants). Accordingly, the invention provides a compound ^ or a physiologically acceptable salt or solvate thereof^for use in the treatment of human or animal subjects suffering from e condition in which there is an advantage in decreasing plasma free fotty acid 10 concentration and/or reducing heart rate and conduction. In a further aspect, the invention provides a method of treatment nM-hirtnAfi animal . t of a^numan or animal subject suffering from a condition in which there is an advantage in decreasing plasma free fatty acid concentration and/or reducing heart rate and conduction which comprises J 15 administering to the subject an effective amount of a compound of formula (I) or a physiologically acceptable salt or solvate thereof. It will be appreciated that reference to treatment includes prophylaxis as well as the alleviation of established symptoms. In yet a further aspect, the invention provides a pharmaceutical 20 composition comprising, as active ingredient,at least one compound of formula (1) or a physiologically acceptable salt or solvate thereof in association with a pharmaceutical carrier and/or excipient for use in human or veterinary medicine. Compositions according to the invention may be formulated for 25 oral, buccal, parenteral or rectal administration or in a form suitable for administration by inhalation or insufflation. Oral administration is preferred. Tablets and capsules for oral administration may contain conventional excipients such as binding agents, for example mucilage 30 of starch or polyvinylpyrrolidone; fillers, for example, lactose, microcrystalline cellulose or .maize-starch; lubricants, for example, magnesium stearate or stearic acid; disintegrants, for example, potato starch, croscarmellose sodium or sodium starch glycollate; or wetting agents such as sodium lauryl sulphate. The tablets may be coated according to methods well known in the art. Oral liquid 35 preparations may be in the form of, for example, aqueous or oily \ ' ' C 22/4C5 / - 6 - suspensions, solutions, emulsions, syrups or elixirs, or may be presented as a dry product for constitution with water or other suitable vehicle before use. Such liquid preparations may contain conventional additives such as suspending agents, for example, 5 sorbitol syrup, methyl cellulose, or carboxymethyl cellulose; emulsifying agents, for example, sorbitan mono-oleate; non-aqueous vehicles (which may include edible oils), for example, propylene glycol or ethyl alcohol; and preservatives, for example, methyl or propyl £-hydroxybenzoates or sorbic acid. The preparations may also 10 contain buffer salts, flavouring, colouring and sweetening agents (e.g. mannitol) as appropriate. For buccal administration the compositions may take the form of tablets or lozenges formulated in conventional manner. tj The compounds of formula (I) may be formulated for 15 parenteral administration by bolus injection or continuous infusion and may be presented in unit dose form in ampoules, or in multi-dose containers with an added preservative. The compositions may take such forms as suspensions, solutions, or emulsions in oily or aqueous vehicles, and may contain formulatory agents such as suspending, 20 stabilising and/or dispersing agents. Alternatively the active ingredient may be in powder form for constitution with a suitable vehicle, e.g. sterile pyrogen-free water, before use. The compounds of formula (I) may also be formulated as suppositories, e.g. containing conventional suppository bases such as 25 cocoa butter or other glycerides. A proposed dose of the compounds of the invention for administration to man (of approximately 70kg body weight) is 2mg to 2g, preferably lOmg to lg, of the active ingredient per unit dose which could be administered, for example, 1 to 4 times per day. It 30 will be appreciated that it may be necessary to make routine variations to the dosage, depending on the age and condition of the patient. The dosage will also depend on the route of administration. In a yet further aspect the invention also provides for the use of a compound of formula (I) or a physiologically acceptable salt or Suitable 35 solvate thereof for the manufacture of a medicamentjfor the treatment of human or animal subjects suffering from a conditioj^jLo^which i 4 • ' • . .... . ^,..,.1. «# vJMife. Cj - ^ 4 211 ! is an advantage in decreasing plasma free fatty acid concentration and/or reducing heart rate and conduction. The compounds of formula (1) and physiologically acceptable 8alts or solvates thereof may be prepared by the processes described hereinafter, said procesaes constituting a further aspect of the invention. In the following description, the groups X and R are as defined for compounds of formula (I) unless otherwise stated. According to a first general process (A), a compound of formula (I) may be prepared by reacting a compound of formula (II): 10 //\ T M /? A A/* UI) 15 X N N /\/°\! HO • I OH OH 20 wherein L represents a leaving group such as a halogen atom (e.g. a chlorine atom) or a trimethylsilyloxy group, or a protected derivative thereof, with a compound of formula RNHj, or a salt or protected derivative thereof, under basic conditions, followed where necessary by removal of any protecting groups as described, for example, in 25 process (D). The compounds of formulae (II) and RNH^ may be protected, for example as described hereinafter. Thus a compound of formula (II) may be protected for example, as the isopropylidene, tribenzoyl or triacetyl derivative, and a compound of formula RNH., may be protected, for example as an lN-benzyl derivative. The reaction may conveniently be effected either in the absence 30 or presence of a solvent such as an alcohol (e.g. a lower alkanol such as propan-2-ol or _t-butanol), an ether (e.g. tetrahydrofuran or dioxan), a substituted amide (e.g. dimethylformamide), a halogenated hydrocarbon (e.g. chloroform) or acetonitrile, preferably at an elevated temperature (e.g. up to the reflux temperature of the 35 8olvent), in the presence of a suitable acid scavenger, for example, -""ilii'i • i' ' 4 -t 22 7 4 - 8 - inorganic bases such as sodium or potassium carbonate, or organic basea such as triethylamine, diisopropylethylamine or pyridine, or alkylene oxides such as ethylene oxide or propylene oxide. Compounds of formulae (II) and RNH^, end protected derivatives 5 thereof, are either known compound8 or may be prepared by conventional method8, for example as described hereinafter. According to another general process (B), a compound of formula (I) wherein X represents a hydrogen atom or a methyl group, may be 10 prepared by rearranging a compound of formula (III): NH I \ /% N • N I I I 15 /\\ /\ /* X N N (III) hAa! 20 25 OH OH wherein X represents a hydrogen atom or a methyl group,or a protected derivative thereof, by heating in the presence of a base such as an alkali metal hydroxide (e.g. sodium hydroxide) or an alkali metal carbonate (e.g. sodium carbonate) and conveniently in a solvent such as an aqueous alcohol (e.g. ethanol), followed where necessary by removal of any protecting groups. The reaction may conveniently be effected at a temperature in the range 50 to 100°C. Compounds of formula (III) and protected derivatives thereof may be prepared by reacting a compound of formula (IV): 30 V I ***>■»-» .. 22 7 4 - 9 - fl l/ \ N (IV) I J \ / \ / X N N HoV^I 10 15 20 25 30 OH OH wherein X represents a hydrogen atom or a methyl group, or a protected derivative thereof, with a strong base such as a Grignsrd reagent (e.g. isopropylmagnesium chloride), followed by reaction with an alkylating agent capable of introducing the desired group R, such as an appropriate halohydrin or epoxide. Thus, for example, when R is a 2-hydroxycyclopentyl group, this compound may be cyclopenteneoxide. Compounds of formula (IV) and protected derivatives thereof are either known compounds or may be prepared by conventional procedures. According to another general process (C), a compound of formula (I) may be prepared from another compound of formula (I) using conventional procedures. Thus, for example, hydrogenation may be used to prepare a compound of formula (I) in which R represents a substituted cycloalkyl group from the corresponding compound of formula (I) in which R represents a substituted cycloalkenyl group. Hydrogenation may also be used to prepare a compound of formula (I) in which X represents a hydrogen atom from the corresponding compound of formula (I) in which X represents a chlorine atom. In this latter case, the hydrogenation is effected in the presence of an acid scavenger such as sodium acetate. Hydrogenation according to general process (C) may be effected using conventional procedures, for example using hydrogen in the presence of a noble metal catalyst (e.g. palladium, Raney nickel, platinum or rhodium). The catalyst may be supported on, for example, charcoal or alumina, or alternatively a homogeneous catalyst such as tris(triphenylphosphine)rhodium choride may be used. The . i»V« *veir^ • ■-W.- r 22 7 4.5 hydrogenation will generally be effected in a solvent such as an alcohol (e.g. methanol or ethanol), an ether (e.g. tetrahydrofuran or dioxan), an ester (e.g. ethyl acetate) or water, or in a mixture of solvents (e.g. a mixture of two or more of those just described), at a 5 temperature in the range -20 to +100°C, and at a pressure of from 1 to 10 atmospheres. It should be appreciated that in the above transformations it may be necessary or desirable to protect any sensitive groups in the compound in question to avoid undesirable side reactions. For 10 example, it may be necessary to protect the hydroxyl groups in a compound of formula (II), (III) or (IV), or the nitrogen atom in a compound of formula RNH^. Examples of suitable hydroxyl protecting groups include acyl (e.g. hydrocarbylcarbonyl groups such as acetyl, benzoyl, pivaloyl 15 and octanoyl); alkyl (e.g. methyl, t-butyl and methoxymethyl); aralkyl (e.g. benzyl, diphenylmethyl, triphenylmethyl and £-methoxyphenyldiphenylmethyl); and silyl (e.g. trialkylsilyl such as t^-butyldimethylsilyl) groups. In addition, two adjacent hydroxyl groups may be protected with an alkylidene (e.g. isopropylidene) 20 group or with a disiloxanyl (e.g. 1,1,3,3-tetraisopropyldisilox- 1,3-diyl) group. Particularly convenient protected derivatives of the compounds of formulae (II),(III) and (IV) are the isopropylidene, triacetyl, tribenzoyl and tri-t-butyldimethylsilyl derivatives. Examples of suitable N-protecting groups for a compound of 25 formula RNH2 include arylmethyl (e.g. benzyl); acyl (e.g.acetyl); and silyl (e.g. trimethylsilyl) groups. Thus according to another general process (D), a compound of formula (I) may be prepared by the removal of any protecting groups from a protected derivative of the compound of formula (I). Deprotection may be effected using conventional techniques such as 30 those described in "Protective Groups in Organic Synthesis" by T.W. Greene (John Wiley and Sons, 1981). Thus, for example, acyl OH-protecting groups may be removed by using methanol in the presence of a base such as potassium carbonate, t>butylamine or ammonia. An isopropylidene group may be removed by 35 acid-catalysed hydrolysis (e.g. using trifluoroacetic or sulphuric 22: 'j - 11 - acid). b-Butyldimethylsilyl groups may be removed by alkaline hydrolysis (e.g. using sodiun hydroxide in ethanol). An JM-benzyl group may be cleaved by hydrogenolysis in the presence of a catalyst (e.g. palladiun on charcoal), for example, as '""N 5 described in process (C). An iN-acyl group (e.g. an acetyl group) or a trimethylsilyl group may be removed under acidic or basic conditions (e.g. using dilute hydrochloric acid or sodium hydroxide). Specific disstereoisomers of a compound of formula (I) may be obtained by conventional methods for example, by synthesis from an appropriate lo asymmetric starting material using any of the processes described herein, or where appropriate by separation of a mixture of isomers of a compound of formula (I) by conventional means e.g by fractional crystallisation or chromatography. In the general processes described above, the compound of formula 15 (I) obtained may be in the form of a salt, conveniently in the form of a physiologically acceptable salt. Where desired, such salts may be converted to the corresponding free bases using conventional methods. Physiologically acceptable salts of the compounds of formula (I) may be prepared by reacting a compound of formula (I) with an 20 appropriate acid or base in the presence of a suitable solvent such ss acetonitrile, acetone, chloroform, ethyl acetate or an alcohol (e.g. methanol, ethanol or isopropanol). Physiologically acceptable salts may also be prepared from other sslts, including other physiologically acceptable salts of the 25 compounds of formula (I), using conventional methods. The invention is further illustrated by the following Intermediates and Examples. Temperatures are in °C. Organic extracts were dried, where indicated, over anhydrous sodium sulphate. Thin layer chromatography (t.l.c.) was carried out on silica. Column 30 chromatography was carried out on silica (Merck 7734) unless otherwise stated and the silics onto which reaction mixtures were adsorbed was also Merck 7734 unless otherwise ststed. Flash colunn chromatography (FCC) was carried out on silica (Merck 9385). Florisil was 60-100 mesh (obtained from BOH). The following abbreviations are used: 35 System A - dichloromethane:ethanol:0.88 ammonia solution; System B -ethyl acetate: methanol; DEA - N^N-diisopropylethylamine; THF - *r-^JS^fcViv.v * • rv 22 7 4 (i 8 - 12 - tetrahydrofuran. 1H-N.m.r. spectra were obtained at 250MHz for dilute solutions in dimethyl sulphoxide. Intermediate 1 5 3-Aza-2-oxabicyclo[2.2.l3heptane-3-carboxylic acid, (phenylmethyl) ester Azodicarbonamide (5.0g) was stirred with a solution of potassium hydroxide (7.0g) in water (12mA) at 4°. After stirring in the ice bath for lh the mixture was diluted with ice/water (30m A) and the 10 solution was filtered. The filtrate was diluted with cool (2°) ethanol (100mA) and the resultant solid was filtered off, washed with ethanol, methanol and ether to give potassium azodicsrboxylate (6.9g). This was then mixed with 3-aza-2-oxabicyclo[2.2.1]hept-5-ene-3-carboxylic acid, (phenylmethyl) ester (0.82g) in dry pyridine 15 (60mA), and acetic acid (2.02g) was added with stirring at room temperature. After one hour a further portion of glacial acetic acid (2.02g) was added and the reaction mixture was stirred for 15.5h. The mixture was evaporated to dryness under reduced pressure. Further acetic acid was then added to quench the remaining yellow colour of 20 the diimide precursor. The residue was partitioned between 0.5M citric acid (75mA) and ethyl acetate (75mJ0 and the organic phase was separated, dried, and concentrated in vacuo. The residue was purified by FCC eluting with ethyl acetate:cyclohexane (1:2) to give the title compound (0.69g) as an oil. 25 T.l.c. (cyclohexane:ethyl acetate, 2:1) Rf 0.25. Intermediate 2 N-(cis-3-Hydroxycyclopentyl)carbamic acid, (phenylmethyl) ester A solution 3-aza-2-oxabicyclo[2.2.1]heptene-3-carboxylic acid, 30 (phenylmethyl) ester (0.5g) in glacial acetic acid (0.5mJl) was added to a stirred suspension of powdered zinc (0.35g) in a mixture of acetic acid and water (1:1; 4mA), and the mixture was stirred at 60u for 7.5h. Additional zinc powder (0.14g) and acetic acid (1mA) were added and stirring was continued for a further 16.5h. After cooling 35 to room temperature, the mixture was filtered and the excess of zinc washed with 2M hydrochloric acid (20mA). The combined filtrate and 2 2 r - 13 - washings were neutralised with 885 sodium carbonate and extracted into ethyl acetate (3x30mA). The combined organic extracts were washed with brine (30mA), dried and concentrated in vacuo. Purification by FCC eluting with 5 ethyl acetate: cyclohexane (1:1) gave an oil (120mg) which solidified upon standing and was recrystallised from cyclohexane to give the title compound (70mg),m.p. 62-63°. Intermediate 3 If t£jgjjg-N-[3-(Formyloxy)cyclopentyl]carbamic acid,(phenylmethyl) ester I Diethyl azodicarboxylate (1.78g) was added dropwise to a stirred solution of N-(cis-3-hydroxycyclopentyl)carbamic acid, (phenylmethyl) ester (1.19g), triphenylphosphine (2.68g) and formic acid (0.47g) in THF (65mA) under nitrogen at room temperature. The resulting solution was stirred for 2h, and concentrated to give a residue which was stirred in ether (20mA) at ca -10° under nitrogen for lh. The mixture was diluted with cyclohexane (20mA), and the solid was filtered off and washed with ether:cyclohexane (1:1; 3x ca. 20mA). The combined filtrate and washings were concentrated, and the resultant residue was purified by FCC eluting with ethyl acetate:cyclohexane (2:3) to give the title compound (1.18g), m.p. 45-48°. 20 25 30 35 Intermediate 4 tran8-3-Aminocyclopentanol hydrochloride A solution of trans N-[3-(formyloxy)cyclopentyl]carbamic acid, (phenylmethyl) ester (l.lg) in ethanol (40mA) was stirred with potassium carbonate (0.25g) at room temperature for lh. The mixture was then filtered and concentrated in vacuo. The resulting semi-solid was dissolved in ethyl acetate (50mA), filtered, and the filtrate was concentrated in vacuo to leave a solid which was hydrogenated in ethanol (50mA) with 5% palladium on carbon (200mg) as catalyst at one atmosphere pressure for 20h. The catalyst was then changed for fresh 5% palladium on carbon (200mg) and the hydrogenation was continued for a further 20h. The reaction mixture was filtered and the filtrate was concentrated iji vacuo. The residue was purified by FCC eluting with ~ 2 2 7 4 8 5 - 14 - System A (40:10:1) to give an oil (0.26g) which was diluted with ethanol (40mA), acidified with 3M ethanolic hydrogen chloride and concentrated in vacuo to give the title compound (0.34g). T.l.c. (Syatem A, 40:10:1) Rf 0.1. C' 5 Intermediate 5 [lgt2g,6p3 - 2-Methyl-6-[(phenylmethyl)amino]cyclohexanol , A mixture of 2-methyl-7-oxabicyclo[4.1.0]heptane (5.0g), benzylamine (5.15g) end water (0.8mA) was heated under reflux for 7.5h under C"^ 10 nitrogen. Purification by FCC eluting with Syatem B (40:1) gave the title compound (3.9g) as a solid. , T.l.c. (System B, 20:1) Rf 0.33. <! Intermediate 6 15 [lgt2ttt663-6-Amino-2-methylcyclohexanol hydrochloride A solution of [la,2a,6p3-2-methyl-6-[(phenylmethyl)amino3cyclohexanol j (3.5g) in absolute ethanol (75mA) was hydrogenated over 10% palladium on charcoal (50% aqueous paste; 1.3g) in absolute ethanol (25mA). The mixture wa8 filtered and evaporated to ca. 100mA. The solution waa j 20 acidified with ca. 1M ethanolic hydrogen chloride and the aolvent was ' evaporated in vacuo to give a solid which was recrystallised twice from i8opropanol - ethyl acetate to give the title compound, m.p. 194-195°. 25 Intermediate 7 1,6-Dihydro-l-(trans-2-hydroxycyclopentyl)-6-imino-9-[[2,3,5-tris-0-(ltl-dimethylethyl)dimethyl8ilyl]-p-D-ribofurano8yl3-9H-purine Isopropylmagnesium chloride (2.0M solution in THF; 1.23mA) was added ; O to a cooled solution of 3° 2',3*,5l-tris-0-[(l,l-dimethylethyl)dimethylsilyl3- adenosine in dry THF (20mA). After stirring for 15min, a solution of cyclopenteneoxide (0.206g) in dry THF (5mA) was added, and the solution was heated under reflux for 3 days. Ethyl acetate (50mA) and water (50mA) were added and the phases were separated. The organic 35 phase was washed with water (50mA), dried and evaporated under reduced pressure. Purification of the residue by column chromatography i \ 22 7 4 - 15 - eluting with System A (800:40:1) gave the title compound as a foam (0.56g). T.l.c. (System A, 800:40:1) Rf 0.54. Intermediate 8 N-[ (15, trans)-2-Hydroxycyclopentyl]-2', 3'-0-[l-methylethylidene3- adenosine A mixture of6-chloro-9-[2',3'-0-(l-methylethylidene)-p-D-ribofuranosyl]purine (25.Og), (IS, trans)-2-aminocyclopentanol 10 hydrochloride (12.64g), DEA (29.67c) and chloroform (250mA) was stirred and heated at reflux under nittogen for 20h. The resultant solution was cooled to ca. 20° and washed with 1M aqueous citric acid (2x150mA). The combined aqueous layers were back extracted with chloroform (2x100mA). The combined organic layer8 were concentrated 15 under reduced pressure to give a foam. Isopropyl acetate (750mA) was added to the foam arid the resultant solution was concentrated to 500mA under reduced pressure to give a slurry which wa8 cooled to 5°. The solid was isolated by filtration, washed with isopropyl acetate (2x50mA) and dried i£ vacuo at 40° to give the title compound (24.8g), 20 m.p. 177-178°. Intermediate 9 2' ,3' t5'-Tri-0-acetyl-N-[(lSttrans)-2-hydroxycyclopentyl jadenosine A mixture of 2* ,3' ,5'-tri-O-acetyl-fi-chloropurine-p-D-riboside (1.06g), (IS,trans)-2-aminocyclopentanol hydrochloride (0.41g) and 25 8odium bicarbonate (0.50g) in isopropanol (12ml) was heated under reflux for 4h. The mixture was evaporated and the residue was purified by column chromatography eluting with System B (50:1) to give the title compound (0.71g) as a glass. T.l.c. (System B, 50:1) Rf 0.21. 30 Intermediate 10 N-f (15,trans)-2-Hydroxycyclopentyl 1-N-(phenylmethyl)adenosine A mixture of 6-chloropurine-p-D-riboside (688mg), (IS,trans)-2[(phenylmethyl)amino Jcyclopentanol (516mg) and DEA (0.67g) 35 in isopropanol (20ml) was stirred and heated under reflux under nitrogen for 7 days. The mixture was then adsorbed onto silica and r ^-2 7^ - 16 - purified by column chromatography eluting with Sy8tem A (75:8:1) to give a foam (0.86g) which waa repurified by column chromatography eluting with ethyl acetate: ethanol (4:1) to give an oil (700mg). This was dissolved in ethyl 5 acetate (10ml) and the re8ulting solution was poured into cyclohexane (30ml) to give the title compound (597mg) as a solid. T.l.c. (System A, 75:8:1) Rf 0.21. Example 1 N-[(15,trans)-2-Hydroxycyclopentyl]adenoaine A mixture of 6-chloropurine-p-D-r-iboside (2.87g) and (IS,trans)-2-aminocyclopentanol hydrochloride (1.38g) was heated under reflux in isopropanol (lOOmA) containing OEA (3.87g) for 18h. Silica gel (20g) was added to the cooled solution end the suspension was 15 evaporated under reduced presaure. The dried support was added to a column of silica gel (250g) and waa eluted with System B (9:1). Appropriate eluates were collected and evaporated under reduced pressure yielding a white powder. Crystallisation from ethyl acetate and methanol gave the title compound as a white powder (2.3g), m.p. 20 163-164°. T.l.c. (System B, 9:1) Rf 0.23. Example 2 N-[(lR,tran8)-2-Hydroxycyclopentyl3adenosine 25 A mixture of 6-chloropurine-p-D-riboside (2.87g) and (1R, trans)-2-aminocyclopentanol hydrochloride (1.38g) was heated under reflux in isopropanol (lOOmJl) containing DEA (3.87g) for 18h. On cooling, a powder was deposited which was filtered off, washed with propan-2-ol (50mA) and dried iji vacuo to give the title compound 30 (2.35g), m.p. 235-236°. T.l.c. (System B, 9:1) Rf 0.23. Example 3 ^lIj£an3-5-Hydroxycyclopent-2-enyl)adenosine A mixture of 6-chloropurine-p-D-riboside (0.86g), trans-3-aminocyclopent-l-en-4-ol, 4-methylbenzenesulphonate (0.69g), di - 17 - and DEA (0.52g) in isopropanol (35mA) was heated at reflux with 8tirring overnight under nitrogen. The cooled mixture was concentrated jhn vacuo to give an oil (2.56g) which was purified by column chromatography on silica (Merck 9385, deactivated with IS triethylamine), eluting with System B (10:1) to give a solid (0.522g). This was recrystalliaed from ethyl acetate (15mA) to give the title compound (185mg). T.l.c. on ailica deactivated with IS triethylamine (System B, 10:1) Rf 0.25. 'H-N.m.r. 6 2.12-2.28(lH,m), 2.65-2.80(lH,m), 3.5-3.78(2H,m), 4.0(lH,ddd), 4.18(lH,m), 4.35(lH,m), 4-.63(lH,q), 5.05(lH,brm), 5.2-5.3 and 5.4-5.55(4H,2xm), 5.7 and 5.86(2H,2xm), 5.92(lH,d),7.92(lH,brd), 8.25(lH,brs), 8.4(lH,s). Example 4 N-(cis-2-Hydroxycyclopent-4-enyl)adeno8inet (Diastereoisomers 1 and 2) A mixture of 6-chloropurine-p-D-riboside (2-01g), cis-2-hydroxycyclopent-4-enylamine hydrochloride (1.42g), DEA (2.71g) and isopropanol (100mA) was heated under reflux for 20h. The resulting solution was adsorbed onto silica and purified by column chromatography eluting with System A (30:8:1) to give a foam which was triturated with System B (10:1; 20mA) to give crystals1 (1.05g). The mother liquors were evaporated to dryness and the resulting solid was recrystallised from methanol (5mA) to give Oiastereoisomer 1 of the title compound (0.31q). 20 0 Optical rotation C=0.5465£ (w/v) in DMSO [a]p = -1-5° . Analysis found: C,50.5; H,5.5; N,19.5; ClbHiyNb°b-°*4CH«»0-0*1H20 requires 0,50.8; H,5.8; N,19.2S8. The crystal1 (1.05g) were recrystallised from methanol (20mA) to give Diastereoisomer 2 of the title compound (0.46g), m.p. 212.5-214°. on 0 _ Optical rotation 0=0.5295755 (w/v) in DMSO [a]* =-131.8 °. Analysis found: C,50.9; H,5.5; N,19.9; Cj^H^N^Ojj.O^HjO requires C,51.05;H,5.5;N,19.8%. 2274 8* - 18 - Example 5 N- (ci8-2-Hydroxycyclopent-4-enyl)adenosine A mixture of 6-chloropurine-p-D-riboside (2.01g), cis-2-hydroxycyclopent-4-enylamine hydrochloride (1.42g), DEA (3.19g) and 5 i8opropanol (100mA) was heated under reflux for 22h. The re8ulting solution was adsorbed onto silica and purified by column chromatography eluting with Syatem B (5:1) to give the title compound (1.7g) as a foam. T.l.c. (System A, 50:8:1) Rf 0.11. (■""v io Analysis found: C,49.5; H,5.6; N,18.9; cibHxyNb°b- °-9H2° requires C,49.3; H,5.7; N,19.255. Example 6 N-(trans-2-Hydroxycyclopentyl)-2-methyladenosine 15 A mixture of 6-chloro-2-methyl-9-(p-D-ribofuranosyl)-9H-purine (902mg), trans-2-aminocyclopentanol (404mg), DEA (517mg) and isopropanol (35mA) was heated under reflux with stirring for 22h under nitrogen. Additional trans-2-aminocyclopentanol (202mg) and DEA (259mg) were added and heating under reflux was maintained for a 20 further 5h. The cooled mixture was concentrated in vacuo and the residual foam (1.9g) was purified by column chromatography on silica (Merck 9385, deactivated with triethylamine) eluting with System B (10:1) to give a solid (l.Olg). This was repurified by column chromatography on silica (Merck 9385) eluting with System B (10:1) to 25 give the title compound (0.57g), m.p. 188-192°. Analysis found: C,52.6; H,6.5; N,19.0; ^16^23^b^b requires C,52.6; H,6.3; N,19.2%. Example 7 30 N- (23-Hydroxy-2-methyIcyclopentyl)adenosine A mixture of 6-chloropurine-p-D-riboside (l.Og) and trans-2-amino-l-methylcyclopentanol hydrochloride (0.55g) in isopropanol (50mA) containing DEA (1.35g) was heated under reflux for 24h. The suspension was adsorbed onto silica and purified by column 35 chromatography eluting with System B (9:1) to give a powder. 2 2 7 4 - 19 - Crystallisation from isopropyl acetate and methanol gave the title compound (0.75g). T.l.c. (Syatem B, 9:1) Rf 0.35. Analyais found:C,50.9} H,6.6; N,18.0; 5 C16H23Nj)0j).O.lCbH10O2.O.75 H^O requires C,51.1; H,6.5; N,18.05%. Example 8 N-(cis-3-Hydroxycyclopenty1)adenosine 6-Chloropurine-p-D-riboside (l.Og), cis-3-aminocyclopentanol 10 (0.48g) and DEA (0.96g) were stirred under reflux in isopropanol (50mA) for 30h. The solution was allowed to cool to room temperature and concentrated in vacuo. Purification by FCC eluting with System A (50:10:1) afforded the title compound (0.9g) as a foam. T.l.c. (System A, 50:10:1) Rf 0.4. 15 Analysis found: C,50.3; H,6.3; N,18.9; ClbH2iNb0b*0*5H2°*0-2C'»HH02 requires C,50.1; H,6.2; N,19.0S. Example 9 N-(tran8-4-Hydroxycyclohexy1)adenosine 20 A mixture of 6-chloropurine-p-D-riboside (1.15g), trans-4- aminocyclohexanol hydrochloride (0.61g), triethylamine (1.12mA) and isopropanol (50mA) was heated under reflux for 18h. More trans-4-aminocyclohexanol hydrochloride (0.30g) and triethylamine (0.56mA) were added and heating was continued for 7h. Further 25 trans-4-aminocyclohexanol hydrochloride (0.30g) and triethylamine (0.56mA) were added and heating was continued for a further 18h. The resulting mixture was adsorbed onto silica and purified by column chromatography eluting with System A (30:8:1) to give a foam. This was washed in hot ether which was then evaporated to leave the title 30 compound (0.82g) as a solid. T.l.c. (System A, 30:8:1) Rf 0.41. Analysis found: C,52.2; H,6.5; N,18.7; C16H23Nt)0l4 requires : C,52.6; H,6.3; N,19.0%. 35 Example 10 227 4 u 3 - 20 - N- (t ran8-2-Hydroxycyclohexy 1) adenosine A mixture of 6-chloropurine-p-D-riboside (1.15g), trans-2-hydroxycyclohexylamine hydrochloride (0.67g), DEA (1.14g) and i8opropenol (50mA) was heated under reflux for 22h. The re8ulting 5 solution was adaorbed onto ailica end purified by column chromatography eluting with System A (30:8:1) to give a foam which was dissolved in ethanol (50mA) and again adaorbed onto ailica. Further purification by colunn chromatography eluting with System B (5:1) gave a solid which wa8 dissolved in ethyl acetate (20mA) and , 10 precipitated with cyclohexane (80mA) to give the title compound (0.48g). T.l.c. (System B, 10:1) Rf 0.10. Analysis found: C,53.1; H,6.7; N,17.9; C16H23NbO;).0.2C6Hjl2.0.2H20 requires C,53.5; H,6.7; Nf18.15%. * J 15 Example 11 N- (ci8-2-Hydroxycyclohexyl) adenosine A mixture of 6-chloropurine-p-D-riboside (1.15g), cis-2-hydroxycyclohexylamine hydrochloride (0.67g), DEA (1.14g) and 20 isopropanol (50mA) was heated under reflux for 30h. The resulting solution was adsorbed onto silica and purified by column chromatography eluting with System B (2:1) to give a solid which was dissolved in ethanol (100mA) and again adsorbed onto silica. Further • purification by column chromatography eluting with System B (5:1) 25 gave a solid which was recrystallised from methanol (20mA) to give the title compound (0.32g), m.p. 210-211°. T.l.c. (System B, 5:1) Rf 0.27. Example 12 30 N-(trans-3-Hydroxycyclohexyl)adenosine A mixture of 6-chloropurine-p-D-riboside (l.Og) and trans-3-aminocyclohexanol hydrochloride (0.53g) in isopropanol (50mA) containing DEA (1.35g) was heated under reflux for 3 days. The resulting suspension was adsorbed onto silica and purified by column 35 chromatography eluting with System A (30:8:1) to give a foam. -!') 2 2 7 4 8 5 21 - Crystallisation from a mixture of iaopropanol and iaopropyl acetate gave the title compound (0.7g). T.l.c. (System A, 50:8:1) Rf 0.27. Analysis found : C,51.8; H,6.6; N,18.2; 5 ci6H23Nb°b*0*1 CiH1002.0.5H20 requires C,51.5; H,6.55; N,18.255. Example 13 jj-(cis-3-Hvdroxycyclohexyl)adenosine 6-Chloropurine-p-O-riboaide (l.Og) and cis-3-aminocyclohexanol hydrochloride (0.53g) were treated according to the method of Example 12 (except that the mixture was heated under reflux for 2 days) to give the title compound (0.58g). T.l.c. (System A, 30:8:1) Rf 0.27. Analysis found: C,52.1; H,6.9; N,17.2; 15 C16H23N50s.0.3Cj)H1002.0.5^ 0 requires C,51.9; H,6.7; N,17.3%. Example 14 N-(trans-4-Hydroxycyclohexyl)-2-methyladenosine A mixture of 6-chloro-2-methyl-9-( (3-D-ribofuranosyl)-9H-purine 20 (902mg), tran8-4-aminocyclohexanol hydrochloride (1.14g) and DEA (1.94g) in isopropanol (50mJl) was heated at reflux with stirring under nitrogen for 17h. The resulting cooled reaction mixture was adsorbed onto ailica (Merck 9385) and purified by colunn chromatography on silica (Merck 9385) eluting with System B (10:1 then 8:1) to give the title compound (0.9g) as a solid. T.l.c. (System B, 5:1) Rf 0.2. Analysis found: C,52.3; H,6.7; N,16.7; Cl.°.33Ci«H802*0*67 requires C,52.3; H,6.95; N,16.6S. 3° Example 15 N-(cis-2-Hydroxycyclopentyl)adenosine A mixture of N-(cis-2-hydroxycyclopent-4-enyl)adenosine (1.6g), 535 platinum on charcoal (0.3g) and ethanol (80mA.) was stirred in the presence of hydrogen for 20h. The resulting mixture was filtered and the filtrate was evaporated. The residue was dissolved in methanol ZJL7 ((. - 22 - (50mA) and the solution was evaporated to yield the title compound (1.2g) as a foam. T.l.c. (Sy8tem A, 30:8:1) Rf 0.30. Analysis found C,49.6; H,6.15; N,19.1; 5 C^jjHg^NjjOjj.0.3011^0.0.5820 requires C,49.6; H,6.3; N,18.95. Example 16 N-(trans-2-Hydroxycyclopentyl)adenoaine A mixture of 6-chloropurine-p-D-ribo8ide (1.15g), 10 trans-2-aminocyclopentanol (0.41g), triethylamine (0.41g) and isopropanol (50ml) wa8 heated under reflux for 20h. Further quantities of trans-2-aminocyclopentanol (0.08g) and triethylamine (0.08g) were added and heating was continued for 4h. The resulting mixture was adsorbed onto silica and purified by column chromatography 15 eluting with Syatem A (30:8:1) to give a solid (0.48g). This was repurified by column chromatography eluting with System B (12:1) to give a foam which wa8 triturated with ether to give the title compound (0.31g) as a 2:1 mixture of diastereoisomers. T.l.c. (System B, 12:1) Rf 0.35. 20 Analysis found C,50.8; H,6.25; N,18.8; Cl&H2lNb°b * 0-17(C2Hb)20 . 0.5^0 requires C,50.5; H,6.4; N,18.8%. o Example 17 N-(tran8-3-Hydroxycyclopentyl)adeno8ine 25 6-Chloropurine-p-D-riboside (0.63g), trans-3-aminocyclopentanol hydrochloride (0.3g) and DEA (0.63g) were stirred under reflux in isopropanol (30mA) for 3.5 days. The reaction mixture was allowed to cool to room temperature, whereupon a precipitate formed which was dissolved by the addition of methanol. The solution was adsorbed onto 30 silica (Merck 9385) and purified by FCC eluting with System B (3:1) to give a powder. Final purification by column chromatography on silica (Merck 7734) eluting with System B (3:1) gave the title compound (44mg), m.p. 208-210°, as a 52:48 mixture of diastereoisomers. 35 c 2J-7 f SVT - 23 - ^H-N.m.r. 6 1.4-2.2(6H,m) 3.5-3.78(2H,m), 3.99(lH,m), 4.1-4.2(lH,m), 4.2-4.3(lH,m), 4.55(lH,d), 4.62(lH,m), 4.8(lH,brm), 5.22(lH,d), 5.42-5.52(2H,m), 5.9(lH,d), 7.82(lH,brd), 8.2(lH,brs), 8.83(lH,s). ^ Example 18 N-(ci8-4-Hydroxycyclohexyl)adenoslne 6-Chloropurine-p-D-riboside (l.Og), cis-4-aminocyclohexanol hydrochloride (0.53g) and DEA (0.96g) were atirred under reflux in iaopropanol (50mA) for 20h. After cooling to room temperature, the I 10 solution was aidsorbed onto Floriail and purified by column chromatography eluting with System A (50:8:1) to give a foam. Further purification by column chromatography as before gave the title compound (0.55g) as a foam. T.l.c. (System A, 50:8:1) Rf 0.07. Analysis found:C,51.9; H,7.0; N,17.5; ci6H23Nb°b*°*55E:t0H*0*3H20 requires C,51.85; H,6.8; N,17.755. 15 20 Example 19 [lg.2B.3g]-N-[2-Hydroxy-3-methylcyclohexyl]adenoaine A mixture of 6-chloropurine-p-O-riboside (l.Og), [la,2a,6 p]-6-amino-2-methylcyclohexanol hydrochloride (0.58g) and DEA (0.9g) in isopropanol (35mjl) was heated under reflux for 26h. The resulting solution was adaorbed onto Florisil end purified by colunn chromatography eluting with System B (20:1 then 10:1) to give the title compound (0.884g), 25 m.p. 128-133°, as a 47:53 mixture of diastereoisomers. T.l.c. (System B, 5:1) Rf 0.65. Analysis found C,53.0; H,6.8; N,16.8; C1/H211N;>Ot).0.3CltHlj02-0.5H20 requires C,52.8; H,6.7; N,16.9%. *"w' 30 Example 20 2-Chloro-N-[(IS,trans)-2-hydroxycyclopentyl]adenosine A mixture of 2,6-dichloro-9-(2',3',5'-tri-0-ben2oyl-p-D-ribofuranosyl) -9lH-purine (1.68g), (IS, trans)-2-aminocyclopentanol hydrochloride (380mg) end DEA (1.4mJl) in iaopropanol (25mJl) was stirred and heated 35 under reflux for 5.5h under nitrogen. The mixture was concentrated ir» vacuo and a solution of the residue in methanol (25mA) was treated 22 7 4 85 - 24 - with aqueous ammonia (2ml). The re8ulting mixture waa atirred for 16h and was then concentrated in vacuo. The residue wa8 purified by column chromatography eluting with System A (75:8:1) to give a foam (570mg). This was dissolved in ethyl acetate (10ml) and the resulting 5 solution was poured into cyclohexane (80mA) to give a 8olid. The solid and cry8tallisation liquor were combined, concentrated in vacuo and the residue was dissolved in methanolic ammonia (10mA). The solution was allowed to stand for 4 days and wa8 then concentrated in vacuo to give an oil (570mg) which was purified by column ^ 10 chromatography eluting with Sysjtem A (50:8:1) to give the title compound (212mg). ; T.l.c. (System A, 50:8:1) Rf 0.16. Analysis found: C,45.9; H,5.55j N,16.7; Cl5H20C1N3°b*0*5C2H60-°*6H20 requires C,45.85; H,5.7; N, 16.785. 15 Example 21 2-Chloro-N-[(1R,trans)-2-hydroxycyclopentyl]adenosine A mixture of 2,6-dichloro-9-(2' ,3' ,5'-tri-13-benzoyl-p-D-ribofuranosyl) -9H-purine (1.68g), (lR-trans)-2-aminocyclopentanol hydrochloride (380mg) and DEA (1.4mA) in isopropsnol (25mA) was stirred and heated under reflux for 5h under nitrogen. The reaction mixture was concentrated in vacuo and a 8olution of the residue in methanol (10mA) was treated with saturated methanolic ammonia (20mA), and kept at room temperature for 8 days. The mixture was concentrated in vacuo and the w 25 residue was purified by column chromatography eluting with System A (50:8:1) to give a glass (770mg). This was dissolved in hot ethyl acetate (40mA) and the resulting solution was poured into cyclohexane (160mA) to give a solid (447mg). This was combined with the residue from the evaporation of the crystallisstion liquor and the resulting solid (1.2g) was adsorbed onto silica and purified by colunn chromatography eluting with System A (75:8:1 then 50:8:1) to give a glass (830mg). This was dissolved in hot ethyl acetate (20mA), and the resulting solution was poured into cyclohexane (160mA) to give the title compound (598mg) as a solid. 35 T.l.c. (System A, 50:8:1) Rf 0.20. Analysis found: C,47.6;H,5.5; N,17.35; ^ 30 St - 25 - C1S)H20C1N;)05.0.1C6H12 requires C,47.55; H,5.4;N,17.75S. Example 22 tran8-2-Chloro-N-(4-hydroxycyclohexyl)adenoeine 5 A mixture of 2,6-dichloro-9-(2' ,3' ,5'-tri-O-benzoyl-p-D-ribofuranosyl) -9H-purine (1.68g), trans-A-eminocyclohexanol hydrochloride (424mg) and OEA (1.4mA) in isopropanol (25mA) was 8tirred and heated under reflux under nitrogen for 4.5h. The reaction was allowed to cool for 30min and waa concentrated in vacuo to give a fotm which was dissolved 10 in methanol (10mA), and saturated methaholic ammonia (20mA) was added. The resulting solution was kept at room temperature for 6 days, end was then adsorbed onto silica and purified by column chromatography eluting with System A (75:8:1 then 30:8:1) to give an oil which crystallised on standing to give a solid (1.02g). This was dissolved 15 in ethanol, filtered and the filtrate waa concentrated in vacuo and triturated with ethyl acetate to give a solid. The solid was repurified by column chromatography eluting with System B (5:1) to give the title compound (405mg), m.p. 203-204°. Analysis found: C,47.9; H,5.6; N,15.75; 20 C16H22ClN,)05.0.35CliH802.0.4H20 requires C,47.75; H.5.9; N,16.05S. Example 23 N-[(lS,trans)-2-Hydroxycyclopentyl]adeno8ine fumaric acid salt(l:l) Fumaric acid (1.2g) was added to a refluxing solution of 25 N-[(IS,trans)-2-hydroxycyclopentyl]adenosine (7.03g) in isopropanol (105mA). The resulting hot solution was filtered, and the filtrate was cooled and allowed to crystallise. After 2h at 20° the crystalline product was isolated by filtration, washed with isopropanol (10mA) and dried in vacuo at 50° for 20h to give the title 30 compound (6.5g), m.p. 179-180°. The chromatographic behaviour of this salt resembled that of an authentic sample of the free base. Example 24 =~[1S?trans)-2-Hydroxycyclopentyl]adenosine (15)-(+)-10- 35 *• -"rwffr 2 2 7 4 - 26 - camphorsulphonic acid salt A mixture of N-[(lS,tran8)-2-hydroxycyclopentyl]adeno8irie (3.51g) and (lS)-(+)-10-camphorsulphonic acid (2.44g) in iaopropanol (35mA) was heated at reflux under nitrogen until a clear solution was obtained. ^ The solution was diluted with isopropyl acetate (50mA) and the mixture was cooled to ca. 25° with 8tirring. The reaultant crystalline solid was isolated by filtration, washed with iaopropanol: isopropyl acetate (1:2; 2x15mA) and dried vacuo at 40° to give the title compound (5.31g), m.p. 150-152°. 10 Analyais found: C,51.25;H,6.7;N,11.9;S,5.3; I CjjjHg/N^OyS requires Cf51.4;H,6.4;N,12.0;S,5.5%. I Example 25 N-[(IS,trans)-2-Hydroxycyclopentyl]adeno8ine 15 A mixture of 6-chloro-9-[2',3*-0-(l-methylethylidene)-p-D-ribofuranosyl]purine (8.0g), (IS, trans)-2-aminocyclopentanol hydrochloride (4.0g), DEA (12.7mA), chloroform (70mA) and isopropanol (10mA) was stirred and heated at reflux, under nitrogen, for 18h. The aolution was then cooled to 25° and wa8hed with 1M citric acid 20 (2x80mA); the aqueous layera were back extracted sequentially with chloroform (2x40mA). The combined chloroform solution8 were extracted with 1M sulphuric acid (50mA + 25mA), and the acid extracts were wa8hed sequentially with chloroform (40mA). The combined sulphuric acid solution was stored at 20° for 2h. Potassium carbonate (50g) was 25 added to the acid solution and the mixture was extracted with isopropanol (2x50mA). The isopropanol extracts were combined and concentrated under reduced pressure to give sn oil which was diluted with methanol (50mA) and reconcentrated. The residue was dissolved in methanol (20mA) at reflux and ethyl acetate (80mA) was added. The solution was filtered and stirred to induce crystallisation. After 4h 30 the cry8talline solid was isolated by filtration, washed with ethyl acetate (20mA) and dried in vacuo at 40° to afford the title compound (4.81g), m.p. 162-163°. Its chromatographic behaviour resembled that of authentic material. 35 Example 26 N-[(IS,trans)-2-Hydroxycyclopentyl3adeno8ine A suspension of 6-chlorpurine-p-D-riboaide (30.Og), (IS,trans)-2-aminocyclopentanol hydrochloride (15.Og) and anhydrous 5 sodium carbonate (30.Og) in b-butenol (300mA) was stirred at reflux under nitrogen for 21h. The suspension was allowed to cool to 72°, filtered, and the collected solid was washed with hot (75°) t-butanol (2x60mA). The combined filtrate and washings were concentrated in vacuo to give a foam. This was dissolved in methanol (55mA) at reflux 10 and then ethyl acetate (550mA) was added dropwise over 0.5h whilst maintaining reflux (ca.65°). The resultant suspension was stirred under nitrogen for 1.5h and cooled to 25°; it was then aged at 20-25° for 1.5h. The solid was filtered off, washed with System B (10:1; 2x60mA) and dried ^Ln vacuo at 50° to give the title compound (31.50g). 15 Its chromatographic behaviour resembled that of authentic material. Analysis found: C,51.2;H,6.0;N,19.8; ClbH21Nb0b requires C,51.3;H,6.0;N,19.9%. Example 27 20 N-(T rana-2-hydroxycyclopenty1)adeno8ine A solution of 1 ^-dihydro-l-Ctrans^-hydroxycyclopentyD^-imino^-C^jS.S-tris-O^ljl-dimethylethyDdimethylsilyll-p-D-ribofuranosyl]-9H^purine (0.3g) in ethanol (20mA) containing 2N sodium hydroxide (5ml) was heated under reflux for 5h. The resulting suspension was 25 adsorbed onto silica and purified by column chromatography eluting with System B (9:1) to give a powder. This was crystallised from ethyl acetate-methanol to give the title compound (O.llg) as a 65:35 mixture of 1R:1S diastereoisomers. T.l.c. (System B, 9:1) Rf 0.26. Analysis found: C,49.5; H,6.1; N,19.6; 30 CxbH2JLNbOb.0.6H20 requires C,49.7; H,6.2; N,19.3%. Hplc: Column: Spherisorb -C8 5jjm (25cmx4.6mm) Mobile phase: 10% acetonitrile in triethylammonium phosphate buffer (pH 3.5) Flow rate: ImA/min 35 Retention times : (1R, trans) 10.2min (65%) (IS, trans) 8.4min (35%) ... . .. « .k iSi 22 7 4 - 28 - Example 28 (IS t trans)-N-(2-Hydroxycyclopenty1)adenosine A solution of (IS, tran8)-2-chloro-N-(2-hydroxycyclopentyl)adenoaine (102mg) and sodium acetate (108mg) in water (3.2mA) and ethanol 5 (8.2mA.) was hydrogenated over 10S» palladium on carbon (503 aqueous lOOmg) for 21h. The mixture was filtered and the filtrate was concentrated to give a solid which was dissolved in hot methanol (4mA). The resulting solution was filtered, and ethyl acetate (2mA) was added to the hot solution to precipitate the title compound 10 (64mg). T.l.c. (System B, 9:1) Rf 0.24. Hplc: Column: Spherisorb -C8 5pm (25cmx4.6mm) Mobile phase: 25% acetonitrile in triethylammonium phosphate buffer (pH 3.5) 15 Flow rate: ImA/min Retention time; 9.6 min (which was the same as that of authentic material). Example 29 20 N-[(lS,trans)-2-Hydroxycyclopentyl]adenosine ]J-[(IS,trans)-2-Hydroxycyclopent y 1]—21,3'-O^[l-methylethylidene]adenos ine (24.Og) was dissolved in a mixture of trifluoroacetic acid (14.2mA) and water (120mA) at ca. 20° and the mixture was stirred under nitrogen for 3.5h. Anhydrous potassium carbonate (28.Og) was 25 added end the solution was extracted with dichloromethane (48mA). Further potassium carbonate (68g) was added and the aqueous layer was extracted with isopropanol (2x48mA). The combined isopropanol extracts were washed with saturated aqueous potassium carbonate (24mA) end the two aqueous phases were extracted sequentially with more isopropanol (48mA). The combined isopropanol extracts were concentrated under 30 reduced pressure to an oil. Methanol (120mA) was added to the oil and the solvent was removed under reduced pressure and then st high vacuum to yield a semi-solid. This was dissolved in hot ethyl acetate (120mA) and the hot solution was clarified by filtration. The i 111 r ii r •■-'-■ -f~ ^p*tfUfijfi**^p ti <i-iyjmjtl,k r> / / 15 2 2 7 4 8 5 10 20 25 - 29 - filtrate was seeded and stirred at ca. 20° for 5h. The solid product was isolated by filtration, washed with System B (8:1; 50mA) and dried in vacuo to give the title compound (17.3g), m.p. 159-162°. Its chromatographic behaviour resembled that of authentic material. Example 30 N-[(lSt trans)-2-Hydroxycyclopentyljadenosine A solution of 2',3'5' -tri-0-acetyl-N-\(IS,trans)-2-hydroxycyclopentyl ]• adenosine (0.34g) in methanol (7ml) containing t-butylamine (3ml) was allowed to stand at 23° for 16h. The solution was evaporated to dryness and residual t-butylamine was removed azeotropically with methanol to leave a glass. Crystallisation of a sample of this glass (0.19g) from a mixture of methanol and ethyl acetate (1:20) gave the title compound (0.15g), m.p. 160-163°. Its chromatographic behaviour resembled that of authentic material. Example 31 N-f(IS,trans)-2-Hydroxycyclopentyl ladenosine A solution of N-[(lSftrans-2-hydroxycyclopentyl ]-N-(phenylmethyl)-adenosine (0.2g) in ethanol (50ml) was hydrogenated at atmospheric pressure and 45° using 10% palladuim on charcoal (O.lg) as catalyst. After 18h the mixture was filtered and the filtrate was evaporated. The residue was crystallised from a mixture of ethyl acetate and methanol to give the title compound (0.075g), m.p. 162-163°. Its chromatographic behaviour resembled that of authentic material. Example 32 N - (trans - 2- Hydroxycyclooctyl)adenosine A mixture of trans-2-aminocyclooctanol (0.34g), 6-chloropurine -0-D-riboside (0.70g) and DEA (0.60g) was heated under reflux in isopropanol (25ml) for 24h. The resulting solution was adsorbed onto Florisil and purified by column chromatography eluting with System B (9:1) to give the title compound (0.43g). T.l.c. (System B, 9:1) Rf 0.38 ^ Analysis found: C, 53.05; H, 7.0; N, 16.9; C18H2/Nb°b * 075H2° requires C,53.1; H,7.1;N,17.2SS. J c w K+$,rv*>&n < 22 7 4 35 - 30 - The following examples illustrate pharmaceutical formulations according to the invention, containing - f(lSttrana)-2-hydroxycyclopentyl ladenoalne as the active ingredient. Physiologically acceptable salts and/or solvates of this compound, and other compounds of formula (I) and their physiologically acceptable salts and/or solvates may be formulated in a similar manner. 10 15 Oral Capsule. Active ingredient Magnesium stearate Starch 1500* * a form of directly compressible starch. Per capsule 50mg 0.5mg 49.5mg Blend the sieved drug with the excipients. Fill the blend into appropriate size hard gelatin capsule filling machine. o 20 25 Oral Syrup Active ingredient Hydroxypropylmethylcellulose USP (viscosity type 4000) Buffer Flavour Colour Preservative Sweetener Purified water per 5ml dose 25mg 25mg As required to 5ml 30 35 Disperse the hydroxypropylmethylcellulose in hot water, cool and then mix with an aqueous slution containing the active ingredient and the other components of the formulation. Adjust the resultant solution to volume and mix. Clarify the syrup by filtration and pack into glass bottles with suitable child resistant closures. n 22 7 - - 31 - Oral Tablet Active ingredient Croscarmellose sodium Magnesium stearate Microcrystalline cellulose to tablet core weight of Per tablet lOOmg 30mg 3mg 300mg 10 Sieve all the ingredients and blend together in a suitable blender until homogenous. Compress with appropriate punches on an automatic tablet machine. The tablets may be covered in a thin polymer coat applied by the usual film coating techniques. A pigment may be included in the filmcoat. 15 4. Sub-lingual Tablet Per tablet Active ingredient 2mg Hydroxypropylmethylcellulose 5mg Magnesium stearate lmg 20 Mannitol to tablet core weight of 65mg Sieve the active ingredient and blend with the mannitol and hydroxypropylmethylcellulose. Add suitable volumes of purified water to granulate. After drying, screen the granules, blend 25 with the magnesium stearate and compress with appropriate punches on an automatic tablet machine. 5. Solution for Inhalation Per 2ml dose 30 Active ingredient 22mg Sodium chloride qs Sodium hydroxide solution to pH 7.2 pH 7.2 phosphate buffer 0.2ml Water suitable for injection to 2ml 35 </div>

Claims

<div class="application article clearfix printTableText" id="claims"> 22 7 4 - 32 - Dissolve the active ingredient in water suitable for injection. Dissolve the sodiun chloride therein and titrate the resulting solution to pH 7.2 with sodium hydroxide solution; add the phosphate buffer solution. Make the solution up to volume with water suitable for injection and sterilise by membrane filtration. Pill aseptically into containers suitable for inhalation by nebulising. )iij^nwiinrii,'i-r",*"*wyT^tY-"**t;ft'a!lt*rt'>—^ •-**• ?2/4e 33 WHAT WE CLAIM IS;

1. Compounds of formula (I) J RNH • • a; OH OH wherein X represents a hydrogen or chlorine atom/ or a methyl group; and R represents a cycloalkyl or cycloalkenyl ring containing 5 to 8 carbon atoms, which ring is substituted by a hydroxy group, and is optionally substituted by a C^_galkyl group; and salts and solvates thereof.

2. Compounds of formula (I) as claimed in claim 1 wherein X represents a hydrogen atom or a methyl group and physiologically acceptable salts and solvates thereof.

3. Compounds of formula (I) as claimed in claim 2 wherein X represents a hydrogen atom and physiologically acceptable salts and solvates thereof.

4. Compounds of formula (I) as claimed in any one of claims 1 to 3 wherein R represents a cycloalkyl or cycloalkenyl ring containing 5 or 6 carbon atoms, substituted by a hydroxy group and optionally by a C^_galkyl group and physiologically acceptable ^ salts and solvates thereof.

5. Compounds of formula (I) as claimed in clal 4 wherein R represents a cycloalkyl ring contain: . mm W<I^Wi>llfi^«?!!Sg^g»^WIBWB^^- -. #.„ - 34 - 5 or 6 carbon atoms substituted by a hydroxy group and optionally substituted by a C1_3 alkyl group on the same carbon atom as the hydroxy group and physiologically acceptable salts and solvates thereof.

6. Compounds of formula (I) as claimed in claim 5 wherein R represents a 2-hydroxycyclopentyl, *4— (t-Kwr0)ltaC«&c£oh«.Xt\[' a hydrexy-cyclohoxyr, 3-hydroxycyclohexyl or^2-hydroxy- 2-methylcyclopentyl group and physiologically acceptable salts and solvates thereof.

7. Compounds of formula (I) as claimed in claim 3 wherein R represents a cyclopentyl ring substituted by a hydroxy group and optionally substituted by a C^_g alkyl group and physiologically acceptable salts and solvates thereof. 8- N-((I

S, Trans)-2-hydroxycyclopentyl]adenosine and physiologically acceptable salts and solvates thereof.

9. N—[(IS, Trans)-2-hydroxycyclopentyl]adenosine? N-[(1R, trans)-2-hydroxycyclopentyl]adenosine; and mixtures thereof; and physiologically acceptable salts and solvates thereof.

10. N-(Trans-4-hydroxycyclohexyl)-2-methyladenosine; N-(cis-4-hydroxycyclohexyl)adenosine; N-(cis-2-hydroxycyclopentyl)adenosine; N-(trans-3-hydroxycyclohexyl)adenosine; N—(28-hydroxy-2-methylcyclopentyl)adenosine; N- (cis-2-hydroxycyclohexyl) adenosine; v^'-Tp ~ ^ 1 C and physiologically acceptable salts and solvates/ /7V thereof. //a? I 2 9 APF

11. Compounds of formula (I) as claimed in any f i v one of claims 1 to 10 and physiologically acceptable1^ .,„^. ,^. ... . r r -, - •- y ^f'+Kpn 227 405 Suitf-tlt salts and solvates thereof^for use in the treatment of human or animal subjects suffering from a condition in which there is an advantage in decreasing plasma free fatty acid concentration and/or reducing heart rate and conduction.

12. The use of a compound of formula (I) as claimed in any one of claims 1 to 10 or a physiologically acceptable salt ot solvate thereof for the manufacture of a medicamentj^for che treatment of human or animal subjects suffering from a condition in which there is an advantage in decreasing plasma free fatty acid concentration and/or reducing heart rate and conduction. noii-JitthQA

13. A method of treatment of afthuman or animal subject suffering from a condition in which there is an advantage in decreasing plasma free fatty acid concentration and/or reducing heart rate and conduction which comprises administering to the subject an effective amount of a compound of formula (I) as claimed in any one of claims 1 to 10 or a physiologically acceptable salt or. solvate thereof.

14. A pharmaceutical composition comprising, as active ingredient, at least one compound of formula (I) as claimed in any one of claims 1 to 10 or a physiologically acceptable salt or solvate thereof in association with a pharmaceutical carrier and/or excipient.

15. A process for preparing a compound of formula (I) as defined in claim 1 wherein \ (a) a compound of formula (II) : //*\ T iri A\ /\ /* X N N I I / ?... OH OH 29 APR I9$] < A A! v.. _ > 36 - wherein L represents a leaving group and X is as defined in claim 1, or a protected derivative thereof, is reacted with a compound of formula RNH2 wherein R is as defined in claim 1 or a salt or protected derivfttive thereof, under basic conditions, followed where necessary by removal of any protecting groups? (b) where it is desired to prepare a compound of formula (I) in which X represents a hydrogen atom or a methyl group, a compound of formula (III): wherein R is as defined in claim 1 and X represents a hydrogen atom or a methyl group, or a protected derivative thereof, is subjected to a rearrangement at elevated temperature in the presence of a base, followed where necessary by removal of any protecting groups? (c) a compound of formula (I) is converted into another compound of formula (X) by a process known per se? or (d) any protecting groups are removed from a protected derivative of the compound of formula (I) ? and any of the above processes being fo OH OH if desired, by the conversion of a compou initially obtained into a salt thereof, o ? 2 7 4 r 5 C n *»l Hi'f* - 37 - conversion of a-salt of a compound of formula (I) into a compound of formula (I) or into a further salt thereof; and any of the above processes being followed/ if desired, by the resolution of a racemate to obtain a desired enantiomer. n

16. A process as claimed in claim 15 (b) wherein the compound of formula (III) or protected derivative thereof is prepared by reacting a compound of formula (IV)* W, '' // \ N HO a\ a / : N N ,/\ A! (IV) OH OH wherein X is as defined in claim 14b) or a protected derivative thereof, with a strong base, followed by reaction with an alkylating agent.capable of introducing the desired group Rr^juKereir. Ril o.s. definetl in claim I) c

17. A compound as claimed in claim 1 substantially as herein described.

18. A pharmaceutical composition substantially as herein described. ^ n flOr\-hurvum

19. A method of treatment of a ^uman or animal f~*294pp| o subject substantially as herein described. yd

20. A process for the preparation of a compound as defined in claim 1 substantially as herein described. G^OUP LIMITED itUrnfei ir attorneys N. SON & CAREY .8 </div>